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The single-line diagram of a three-phase power system is shown in below Figure. Equipment ratings are given as follows: Synchronous generators: GI 1000 MVA G2 1000 MVA G3 500 MVA 750 MVA G4 Transformers: TI T2 T3 T4 1000 MVA 1000 MVA 500 MVA 750 MVA Transmission lines: 500 kV 500 kV 500 kV 1-2 1-3 2-3 15 kV 15 kV 13.8 kV 13.8 kV b) XdX2= 0.18, Xo = 0.07 per unit Xd" = X2=0.20, Xo = 0.10 per unit Xd X2= 0.15, Xo = 0.05 per unit Xa=0.30, X₂=0.40, Xo = 0.10 per unit 15 kV A/500 kV Y 15 kV A/500 kV Y 15 kV Y/500 kV Y 15 kV Y/500 kV Y X = 0.10 per unit X= 0.10 per unit X = 0.12 per unit X=0.11 per unit Χι = 50 Ω, Χ = 150 Ω X₁40 S2, Xo= 100 2 Xy = 40 Ω, Χο = 100 Ω a) The inductor connected to Generator 3 neutral has a reactance of 0.05 per unit using generator 3 ratings as a base. Draw the zero-, positive-, and negative-sequence reactance diagrams using a 1000-MVA, 500-kV base in the zone of line 1-2. Neglect the A-Y transformer phase shifts. Faults at bus 1 are of interest. Determine the Thévenin equivalent of each sequence network as viewed from the fault bus 1. Prefault voltage is 1.0 per unit. Prefault load currents and A-Y transformer phase shifts are neglected. (Hint: Use the Y-A conversion.) Determine the subtransient fault current in per-unit and in kA during a bolted three-phase fault at the fault bus 1.

The single-line diagram of a three-phase power system is shown in below Figure. Equipment ratings are given as follows: Synchronous generators: GI 1000 MVA G2 1000 MVA G3 500 MVA 750 MVA G4 Transformers: TI T2 T3 T4 1000 MVA 1000 MVA 500 MVA 750 MVA Transmission lines: 500 kV 500 kV 500 kV 1-2 1-3 2-3 15 kV 15 kV 13.8 kV 13.8 kV b) XdX2= 0.18, Xo = 0.07 per unit Xd" = X2=0.20, Xo = 0.10 per unit Xd X2= 0.15, Xo = 0.05 per unit Xa=0.30, X₂=0.40, Xo = 0.10 per unit 15 kV A/500 kV Y 15 kV A/500 kV Y 15 kV Y/500 kV Y 15 kV Y/500 kV Y X = 0.10 per unit X= 0.10 per unit X = 0.12 per unit X=0.11 per unit Χι = 50 Ω, Χ = 150 Ω X₁40 S2, Xo= 100 2 Xy = 40 Ω, Χο = 100 Ω a) The inductor connected to Generator 3 neutral has a reactance of 0.05 per unit using generator 3 ratings as a base. Draw the zero-, positive-, and negative-sequence reactance diagrams using a 1000-MVA, 500-kV base in the zone of line 1-2. Neglect the A-Y transformer phase shifts. Faults at bus 1 are of interest. Determine the Thévenin equivalent of each sequence network as viewed from the fault bus 1. Prefault voltage is 1.0 per unit. Prefault load currents and A-Y transformer phase shifts are neglected. (Hint: Use the Y-A conversion.) Determine the subtransient fault current in per-unit and in kA during a bolted three-phase fault at the fault bus 1.

Introductory Circuit Analysis (13th Edition)
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
Section: Chapter Questions
Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...
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The single-line diagram of a three-phase power system is shown in below Figure. Equipment ratings are given as follows: Synchronous generators: GI 1000 MVA G2 1000 MVA G3 500 MVA 750 MVA G4 Transformers: TI T2 T3 T4 1000 MVA 1000 MVA 500 MVA 750 MVA Transmission lines: 500 kV 500 kV 500 kV 1-2 1-3 2-3 b) 15 kV 15 kV 13.8 kV 13.8 kV d) XdX2= 0.18, Xo = 0.07 per unit Xd" = X2=0.20, Xo = 0.10 per unit Xd X2= 0.15, Xo = 0.05 per unit Xa=0.30, X₂=0.40, Xo = 0.10 per unit 15 kV A/500 kV Y 15 kV A/500 kV Y 15 kV Y/500 kV Y 15 kV Y/500 kV Y X = 0.10 per unit X= 0.10 per unit X = 0.12 per unit X=0.11 per unit a) The inductor connected to Generator 3 neutral has a reactance of 0.05 per unit using generator 3 ratings as a base. Draw the zero-, positive-, and negative-sequence reactance diagrams using a 1000-MVA, 500-kV base in the zone of line 1-2. Neglect the A-Y transformer phase shifts. Χι = 50 Ω, Χ = 150 Ω X₁40 S2, Xo= 100 2 Xy = 40 Ω, Χο = 100 Ω Faults at bus 1 are of interest. Determine the Thévenin equivalent of each sequence network as viewed from the fault bus 1. Prefault voltage is 1.0 per unit. Prefault load currents and A-Y transformer phase shifts are neglected. (Hint: Use the Y-A conversion.) Determine the subtransient fault current in per-unit and in kA during a bolted three-phase fault at the fault bus 1. Determine the subtransient fault current in per-unit and in kA, as well as the per-unit line-to-ground voltages at the fault bus for a bolted single line-to-ground fault at the faul Page 3 / 5 Q +
Transcribed Image Text:The single-line diagram of a three-phase power system is shown in below Figure. Equipment ratings are given as follows: Synchronous generators: GI 1000 MVA G2 1000 MVA G3 500 MVA 750 MVA G4 Transformers: TI T2 T3 T4 1000 MVA 1000 MVA 500 MVA 750 MVA Transmission lines: 500 kV 500 kV 500 kV 1-2 1-3 2-3 b) 15 kV 15 kV 13.8 kV 13.8 kV d) XdX2= 0.18, Xo = 0.07 per unit Xd" = X2=0.20, Xo = 0.10 per unit Xd X2= 0.15, Xo = 0.05 per unit Xa=0.30, X₂=0.40, Xo = 0.10 per unit 15 kV A/500 kV Y 15 kV A/500 kV Y 15 kV Y/500 kV Y 15 kV Y/500 kV Y X = 0.10 per unit X= 0.10 per unit X = 0.12 per unit X=0.11 per unit a) The inductor connected to Generator 3 neutral has a reactance of 0.05 per unit using generator 3 ratings as a base. Draw the zero-, positive-, and negative-sequence reactance diagrams using a 1000-MVA, 500-kV base in the zone of line 1-2. Neglect the A-Y transformer phase shifts. Χι = 50 Ω, Χ = 150 Ω X₁40 S2, Xo= 100 2 Xy = 40 Ω, Χο = 100 Ω Faults at bus 1 are of interest. Determine the Thévenin equivalent of each sequence network as viewed from the fault bus 1. Prefault voltage is 1.0 per unit. Prefault load currents and A-Y transformer phase shifts are neglected. (Hint: Use the Y-A conversion.) Determine the subtransient fault current in per-unit and in kA during a bolted three-phase fault at the fault bus 1. Determine the subtransient fault current in per-unit and in kA, as well as the per-unit line-to-ground voltages at the fault bus for a bolted single line-to-ground fault at the faul Page 3 / 5 Q +
Line 1-2 Line 1-3 2 2 T₂ Line 2-3 3 T3 38 TA 38 21 Ý 3 4 youthiy
Transcribed Image Text:Line 1-2 Line 1-3 2 2 T₂ Line 2-3 3 T3 38 TA 38 21 Ý 3 4 youthiy
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